avcodec: WBMP (Wireless Application Protocol Bitmap) image format

Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: Peter Ross <pross@xvid.org>

1 files changed, 89 insertions, 0 deletions

diff --git a/libavcodec/wbmpenc.c b/libavcodec/wbmpenc.c
new file mode 100644
index 0000000000..c2dd5f5ca9
--- /dev/null
+++ b/libavcodec/wbmpenc.c
@@ -0,0 +1,89 @@
+/*
+ * WBMP (Wireless Application Protocol Bitmap) image
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "codec_internal.h"
+#include "encode.h"
+
+static void putv(uint8_t ** bufp, unsigned int v)
+{
+    unsigned int vv = 0;
+    int n = 0;
+
+    while (vv != v)
+        vv += v & (0x7F << 7 * n++);
+
+    while (--n > 0)
+        bytestream_put_byte(bufp, 0x80 | (v & (0x7F << 7 * n)) >> 7 * n);
+
+    bytestream_put_byte(bufp, v & 0x7F);
+}
+
+static void writebits(uint8_t ** bufp, const uint8_t * src, int width, int height, int linesize)
+{
+    int wpad = (width + 7) / 8;
+    for (int j = 0; j < height; j++) {
+        memcpy(*bufp, src, wpad);
+        *bufp += wpad;
+        src += linesize;
+    }
+}
+
+static int wbmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+                            const AVFrame *frame, int *got_packet)
+{
+    int64_t size = avctx->height * ((avctx->width + 7) / 8) + 32;
+    uint8_t *buf;
+    int ret;
+
+    if ((ret = ff_get_encode_buffer(avctx, pkt, size, 0)) < 0)
+        return ret;
+
+    buf = pkt->data;
+
+    putv(&buf, 0);
+    bytestream_put_byte(&buf, 0);
+    putv(&buf, avctx->width);
+    putv(&buf, avctx->height);
+
+    if (frame->linesize[0] == (avctx->width + 7) / 8)
+        bytestream_put_buffer(&buf, frame->data[0], avctx->height * ((avctx->width + 7) / 8));
+    else
+        writebits(&buf, frame->data[0], avctx->width, avctx->height, frame->linesize[0]);
+
+    av_shrink_packet(pkt, buf - pkt->data);
+
+    *got_packet = 1;
+    return 0;
+}
+
+const FFCodec ff_wbmp_encoder = {
+    .p.name         = "wbmp",
+    .p.long_name    = NULL_IF_CONFIG_SMALL("WBMP (Wireless Application Protocol Bitmap) image"),
+    .p.type         = AVMEDIA_TYPE_VIDEO,
+    .p.id           = AV_CODEC_ID_WBMP,
+    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
+    FF_CODEC_ENCODE_CB(wbmp_encode_frame),
+    .p.pix_fmts     = (const enum AVPixelFormat[]){
+        AV_PIX_FMT_MONOBLACK,
+        AV_PIX_FMT_NONE
+    },
+};